High-glycemic-index carbs ... yeah, we've heard how their the food of the devil. They'll raise your blood sugar, lead to fat storage, and possibly usher in Armageddon. Okay, maybe that last one is pushing a bit, but for some people - especially hormonally discomfited teenagers - it may cause something that seems like the end of the world: ACNE.

A study that appeared in the American Journal of Clinical Nutrition confirmed earlier reports that eating white bread, pasta, white rice, and sugary snacks and drinks can lead to skin breakouts. Because high GI carbs are digested quickly, they spike blood glucose levels that produce insulin. An excess of insulin production thickens hair follicles, which, in turn, traps oil on the skin. The end result: You feel embarrassed to ask that girl from your 4th period Pre-Calculus class to the prom.